Systems Administrator

Server & platform engineering - Design, deploy, and maintain Windows Server environments (Active Directory, DNS, DHCP, GPO, PKI) - Administer Linux servers (RHEL/CentOS/Ubuntu) — installation, hardening, patching, and performance tuning - Manage services running on Linux: web servers, databases, application runtimes, and scheduled jobs - Administer and optimise virtualisation platforms (VMware vSphere / Hyper-V) at scale - Manage and develop the hybrid Azure infrastructure — IaaS, resource groups, policy, cost management - Own the Microsoft 365 tenant administration: Exchange Online, Teams, SharePoint, OneDrive, Intune - Manage Azure Active Directory / Entra ID: identity governance, conditional access, SSO, MFA - Drive automation using PowerShell, Azure Automation, or similar scripting tools Network & security engineering - Design and manage network architecture: routing, switching, VLANs, SD-WAN, firewalls - Implement and maintain security baselines: patch management, CIS benchmarks, endpoint hardening - Manage Microsoft Defender, Sentinel, or equivalent SIEM/EDR tooling - Operate and improve backup, replication, and disaster recovery solutions - Support IT security audits, risk assessments, and compliance requirements Global projects & architecture - Collaborate as an equal peer with the systems team at Bertus HQ in the Netherlands - Contribute to and lead global infrastructure rollouts, migrations, and standardisation projects - Evaluate and recommend new technologies, platforms, and architectural improvements - Participate in architectural decisions and capacity planning across both sites - Maintain thorough documentation of architecture, runbooks, and change records - Participate in on-call rotation for critical incidents across time zones Required knowledge & experience - Bachelor’s degree (B.Tech / BCA / BSc IT or equivalent) in a relevant IT discipline - 4–7 years of hands-on experience in a systems engineering or infrastructure role — not helpdesk - Deep expertise in Windows Server, Active Directory, and Microsoft 365 / Azure administration - Strong Linux administration skills: RHEL/CentOS or Ubuntu/Debian in a production environment - Experience with Linux system hardening, package management, systemd, and log analysis - Strong virtualisation skills: VMware vSphere and/or Microsoft Hyper-V - Solid networking knowledge: TCP/IP, BGP/OSPF, VLANs, firewalls, VPN - Proficiency in scripting for automation: PowerShell and Bash (Python is a plus) - Fluent written and spoken English — you will work daily with Dutch colleagues Nice to have — bonus points - Microsoft certifications: AZ-104, AZ-305, MS-102, SC-300 or equivalent - Linux certifications: RHCSA, RHCE, LPIC-1/2, or equivalent - Experience with VMware certifications (VCP) or NSX - Familiarity with DevOps tooling: Terraform, Ansible, CI/CD pipelines - Experience in an international or European-headquartered organisation - ITIL or similar service management framework experience Skills:- System Administration, Microsoft Windows Server, Active Directory, Windows Azure, Microsoft Windows, Windows PowerShell, VMWare, Hyper V, TCP/IP, Computer Networking and Intune